head.java

采用jsp+servlet+javabean

package guestbook;

import java.util.Date;
import javax.servlet.http.*;
import java.text.SimpleDateFormat;

public class Head {
  private static String userid=null;
  private static boolean flag=false;
  public static String getTime(){
    String format="MM-dd-yyyy hh:mm a";//格式化日期和时间
    SimpleDateFormat formatter=new SimpleDateFormat(format);
    Date nowdate=new Date();
    return formatter.format(nowdate);
  }
  //判断是否用户登陆
  public static boolean checkUserLogin(HttpServletRequest request){
    Cookie[] c=request.getCookies();
    if(c==null){
      flag=false;
    }
    else{
      for (int i = 0; i < c.length; i++) {
        if (c[i].getName().equals("USER")) {
          flag=true;
          userid = c[i].getValue();
        }
      }
    }
    return flag;
  }
  //判断是否管理员登陆
  public static boolean checkAdminLogin(HttpServletRequest request){
    Cookie[] c=request.getCookies();
    if(c==null){
      return false;
    }
    else{
      for (int i = 0; i < c.length; i++) {
        if (c[i].getName().equals("ADMIN")) {
          return true;
        }
      }
      return false;
    }
  }
  public static String getUserid(){
    if(!flag) userid="I am a guest";
    return userid;
  }
}